Disclosed is a beamforming method for microwave power transmission. The beamforming method includes sending, by a transmitter, microwaves to each training slot based on a random phase through antennas, receiving from a receiver, by the transmitter, a power measurement value for each of the training slots, estimating, by the transmitter, a channel using the received power measurement value, and determining, by the transmitter, beamforming weight based on information about the estimated channel.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A beamforming method for microwave power transmission, comprising: sending, by a transmitter, microwaves in slots based on a random phase through antennas; receiving from a receiver, by the transmitter, a measured power of each of the slots; estimating, by the transmitter, a channel gain using the received measured power of each of the slots; and determining, by the transmitter, a beamforming weight based on the estimated channel gain.
2. The beamforming method of claim 1 , wherein the transmitter determines the beamforming weight such that received power in the receiver is maximized.
3. The beamforming method of claim 1 , wherein the estimating of the channel gain comprises estimating the channel gain by applying a state space model in which the channel gain has a linear relation with the received measured power of each of the slots and is defined by a Kalman filter.
4. The beamforming method of claim 1 , wherein the estimating of the channel gain comprises generating a new energy channel matrix by applying an energy channel matrix calculated as the measured power using a Kalman filter.
5. The beamforming method of claim 1 , wherein the transmitter determines the beamforming weight so that the beamforming weight has a conjugate phase of a channel estimated in a previous frame and a magnitude value which is a square root value of a maximum power available through one antenna among the antennas.
6. The beamforming method of claim 1 , further comprising: sending, by the transmitter, microwaves for power transmission to the antennas based on the beamforming weight.
7. The beamforming method of claim 6 , wherein the antennas comprise either one of a collocated antenna array and a distributed antenna array.
8. An apparatus for sending microwaves for power transmission based on beamforming, comprising: antennas configured to send microwaves in slots based on a random phase; a first receiver configured to receive a measured power of each of the slots from a second receiver; and a controller configured to estimate a channel gain using the received measured power of each of the slots, and to determine a beamforming weight based on the estimated channel gain.
9. The apparatus of claim 8 , wherein the controller is further configured to determine the beamforming weight such that received power in the second receiver is maximized.
10. The apparatus of claim 8 , wherein the controller is further configured to determine the beamforming weight so that the beamforming weight has a conjugate phase of a channel estimated in a previous frame and a magnitude value which is a square root value of a maximum power available through one antenna among the antennas.
11. The apparatus of claim 8 , wherein the controller is further configured to send microwaves for power transmission by performing beamforming based on the beamforming weight.
12. The apparatus of claim 8 , wherein the controller is further configured to estimate the channel gain by applying a state space model in which the channel gain has a linear relation with the received measured power and is defined by a Kalman filter.
13. A beamforming method for microwave power transmission, comprising: sending, by a transmitter, microwaves to each slot based on a random phase through antennas; receiving from a receiver, by the transmitter, a power measurement value for each slot; estimating, by the transmitter, a channel using the received power measurement value for each slot; and determining, by the transmitter, a beamforming weight based on information about the estimated channel, wherein the transmitter estimates the channel by applying a state space model in which a channel gain having a linear relation with the received power measurement value for each slot is defined by a Kalman filter.
14. The beamforming method of claim 1 , wherein the slots are temporal slots occurring in a temporal frame along with a temporal power transmission slot.
15. The beamforming method of claim 14 , wherein the beamforming weight optimizes a beam of microwaves sent from the transmitter to the receiver in the power transmission slot.
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August 31, 2017
December 18, 2018
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